In this image, captured by NASA’s Cassini spacecraft, Saturn’s moon Enceladus appears above the rings and the moon Rhea is below. Where is a third moon? Find the comparatively tiny speck of Atlas above and to the left of Rhea – about two Rhea-diameters away – just above the thin line of Saturn’s F ring.

This view – taken on September 24, 2015 – looks toward the unilluminated side of the rings from about 0.34 degrees below the ring plane, at a distance of approximately 1.8 million miles (2.8 million kilometers) from the moon Rhea.

Saturn has 62 known moons, (not including the hundreds of moonlets that make up the rings) 53 of which are named. Most of the moons are small, but Titan, Saturn’s biggest moon, is larger than the planet Mercury.

Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. Today, as Lead Editor at EarthSky.org, she helps present the science and nature stories and photos you enjoy. She also serves as one of the voices of EarthSky on social media platforms including Facebook, Twitter and G+. She and her husband live in Tennessee and have two grown sons.